Abstract
A mechanism is postulated to explain the effects of drop composition and substrate temperature on the adherence of molten synthetic coal ash drops to steel substrates. For a strong bond to form between the drop and the oxide film on the substrate, it is necessary to form an interfacial region consisting of both iron oxide and slag. Depth profile analysis by ion beam spectrochemical analysis indicates that the thickness of this interfacial region is 1–3 μm. The formation of this region is expected to be assisted by long times of contact of liquid slag with the substrate. A heat transfer calculation indicates that high substrate temperature and lower solidus temperature greatly increased the time to completely solidify a 2 μm thick interface.
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